State health officials have identified a second strain of salmonella bacteria linked to at least one person sickened by eating at a Sheetz convenience store, reports the Associated Press.

Health officials say that likely means only that the tainted tomatoes were all eaten by the time the samples were taken. Those tests, conducted last week, did find a second salmonella strain in an unopened bag of tomatoes at a Franklin County Sheetz store.

Richard McGarvey, state health department spokesman, said there is no cause for alarm because no matter which strain was involved, everybody who got sick ate at Sheetz stores in the first week of July. Since then, Sheetz has removed the tomatoes in question.

Two lawsuits have been filed as a result of the outbreak, both targeting Coronet Foods of Wheeling, West Virginia. Coronet has said laboratory tests found no salmonella at its processing plant, but it has still stopped buying and processing the precut Roma tomatoes that health officials believe caused the outbreak.

Sheetz has 300 stores in six states -- five of which are reporting salmonellosis cases linked or believed to be linked to its sandwiches.